Trumpet-action.



R. ORSI.

TRUMPET ACTION.

APPLlCATlON HLED JULY 19. I913.

I Patented May 4:, 1915.

JNVENTOR OM50 0R5! ATORNEY {HE NORRIS PETERS 60., PHOTO-LITHCL, WASHINGTON, D. C.

ROMEO ORSI, OEMILAN, ITALY.

TRUMPET-ACTION.

Application filed July 19, 1913.

To all whom it may concern:

Be it known that I, ROMEO ORSI, a subject of the King of Italy, and residing in Milan, Italy, have invented certain new and useful Improvements in Trumpet-Actions, of which the following is a specification.

This invention relates to a trumpet action and has for its object to provide a useful and novel form of device which is eflective, ready, durable and easily interchangeable.

The system hitherto used in connection with trumpet keys consists in arranging around a vertical pivot a spiral spring inclosed in a casing. The practical use of such a device has shown that in the course of time dust enters the casing, greatly affecting the movement of the key as well as the elasticity of the spring, the whole resulting in a production of bad tone. Furthermore, owing to the length of the spring, the influence of temperature is very powerful; long use varies the tension of the spring. The arrangement of a spiral spring in the old device entails a lot of work and time, while for the user it is of considerable advantage to be able to change the spring instantly, without the use of special tools and particular skill.

The object of the present invention is to eliminate all the above mentioned drawbacks by the use of a needle spring the arrangement of which is so simple that the mere turning of a thumb screw allows of a rapid substitution of another spring.

The invention is illustrated in a preferred embodiment in the accompanying drawing, wherein- Figure l is an axial section in a system of three keys on line az of Fig. 4; Fig. 2 is a bottom plan view of a key; Fig. 3 is a section through line wy of Figs. 1, 2; Fig. 4 is a side view of Fig. 2 with the pivot in section on the line 11-10 Fig. 1; Fig. 5 is a diagrammatic representation of the action Specification of Letters Patent.

Patented May 4, 1915.

Serial No. 780,033.

of 1the needle spring drawn to an enlarged sca e.

Like numerals of reference indicate like parts in the several figures.

A general pivot l is mounted on bearings 2 and fixed at one end by a thumb nut 3. The keys 4 are pivotally mounted on pivot 1 through their hubs 5. Each needle spring 6 is fixed by one end within the corresponding projection 7 of each bearing 2, by means of thumb screw 8, parallel to pivot 1; it passes through slot 9 of the key arm 10 and remains in contact at its other end with a stop or projection 11 attached to hub 5.

Fig. at shows the valve 13 and the arm 14 with connecting rod 15 of which parts no detailed description is required as they are generally known parts.

To change the needle spring 6 it is only necessary to loosen the thumb screw 3, take ofl old needle and replace it by a new one.

Having now described my invention what I claim as new and desire to secure by Letters Patent is A trumpet action of the kind described comprising a plurality of slotted key levers,

a tubular hub on each, a common pivot rod within and supporting the hubs, column bearings for the pivot rod, lugs on said bearings, a needle spring for each key lever arranged parallel to the pivot rod and extending through the slot in each key lever, a thumb screw on said lugs to retain one end of each spring in position relative to the hub and a stop projecting from each of the hubs to engage the other end of each needle spring whereby the rotation of the hub will tension the spring.

Milan this 24th of June, 1913.

ROMEO ORSI.

Witnesses: GUARNIERI G. GIACOMA, P. J. KEELAN.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

